package com.rollCall.common.interceptor;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.rollCall.common.constant.MessageConstant;
import com.rollCall.entity.Jwt;
import com.rollCall.mapper.JwtMapper;
import com.rollCall.common.properties.JwtProperties;
import com.rollCall.common.util.UserHolder;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
@RequiredArgsConstructor
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    private final JwtProperties jwtProperties;
    private final JwtMapper jwtMapper;

    /**
     * 校验jwt
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler){
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        HandlerMethod handlerMethod= (HandlerMethod) handler;
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Jwt jwt = jwtMapper.selectOne(new QueryWrapper<Jwt>().eq("jwt", token));
            if (jwt == null){
                throw new RuntimeException("用户未登录");
            }
            UserHolder.set(jwt.getStudentId());
            log.info("当前学生id:{}", jwt.getStudentId());
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            log.error(MessageConstant.USER_NOT_LOGIN);
            response.setStatus(401);
            return false;
        }
    }


}
